Woof – Categories terms hidden after filter

Hi,
After filtering using the categories, the categories drop down disappear. Please check and let me know asap.

https://accretech.webographen.de/en/productfinder/?swoof=1&pa_arbeitsumgebung=messraum&product_cat=rauheit&pa_z-messbereich=1mm

The page I need help with: [log in to see the link]